Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 6
Articles | Volume 19, issue 6
https://doi.org/10.5194/amt-19-2265-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-2265-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 6
Research article
 | 
01 Apr 2026
Research article |  | 01 Apr 2026

Fast and reproducible δ13C-CO2 analysis from 1 mL of ambient atmospheric air using continuous-flow IRMS: from sampling to storage to analysis

Joana Sauze, Marie-Laure Tiouchichine, Alexandru Milcu, and Clément Piel

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Short summary
We present a simple workflow for high-precision δ¹³C-CO₂ analysis from 1 mL air samples using cryogenic pre-concentration and continuous-flow isotope-ratio mass spectrometry (IRMS). The method combines vial conditioning, dual sealing, and −80 °C storage to minimise gas loss. It achieves ±0.1 ‰ precision and stable isotopic values for up to one week of storage. This low-cost approach enables high-frequency δ¹³C-CO₂ measurements in volume-limited systems such as microcosm or chamber experiments.
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